CN216742869U

CN216742869U - Electronic expansion valve

Info

Publication number: CN216742869U
Application number: CN202123001229.1U
Authority: CN
Inventors: 金钜; 沙海建; 王傅钢
Original assignee: Dunan Automotive Thermal Management Technology Co Ltd
Current assignee: Dunan Automotive Thermal Management Technology Co Ltd
Priority date: 2021-03-17
Filing date: 2021-11-30
Publication date: 2022-06-14
Anticipated expiration: 2031-11-30
Also published as: CN216742870U; EP4296547A1; CN216742871U; WO2023098766A1; CN216742868U; CN219345507U; CN219345508U; KR20230156775A; WO2022193812A1; CN216742872U; WO2023098768A1; JP2024510724A; CN115111378A; WO2023098767A1

Abstract

The utility model provides an electronic expansion valve, include: the valve seat is provided with a first mounting channel extending along the axial direction, and a valve port is arranged in the first mounting channel; the valve needle is movably arranged in the first mounting channel to block or avoid the valve port, and a mounting gap is formed between the wall surface of the first mounting channel and the outer wall of the valve needle; a first seal mounted on the valve needle, the first seal being located within the mounting gap to seal the mounting gap with the first seal. Through the technical scheme provided by the utility model, can solve the relatively poor, the needle of sealing performance of electronic expansion valve among the prior art and easily take place the technical problem of drunkenness.

Description

Electronic expansion valve

Technical Field

The utility model relates to an electronic expansion valve technical field particularly, relates to an electronic expansion valve.

Background

Currently, the electronic expansion valve in the prior art generally comprises a valve seat and a valve needle, wherein the valve needle is movably arranged in the valve seat to open or close the valve port through the valve needle.

However, since a certain gap is formed between the outer wall of the valve needle and the outer wall of the valve seat, part of the fluid in the valve seat flows out through the gap between the outer wall of the valve needle and the inner wall of the valve seat, which results in poor sealing performance of the electronic expansion valve. The clearance between the valve needle and the valve seat is too large, so that the valve needle is easy to move; the clearance between the valve needle and the valve seat is too small, so that the valve needle and the valve seat are easily clamped.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an electronic expansion valve to solve the technical problems of the prior art that the sealing performance of the electronic expansion valve is poor and the valve needle is easy to move.

In order to achieve the above object, the present invention provides an electronic expansion valve, including: the valve seat is provided with a first mounting channel extending along the axial direction, and a valve port is arranged in the first mounting channel; the valve needle is movably arranged in the first mounting channel to block or avoid the valve port, and a mounting gap is formed between the wall surface of the first mounting channel and the outer wall of the valve needle; a first seal mounted on the valve needle, the first seal being located within the mounting gap to seal the mounting gap with the first seal; the first sealing element and the first mounting channel are in an interference fit structure, and the interference magnitude of the first sealing element is l, wherein l is larger than 0.3 mm.

Further, the first sealing element is a sealing ring, and the sealing ring is sleeved on the valve needle.

Further, the outer wall of needle is equipped with the mounting groove, and the sealing washer is installed in the mounting groove, and the sealing washer external diameter is greater than the needle external diameter.

Furthermore, the distance between the wall surface of the first mounting channel and the outer wall of the valve needle is d, and d is more than 0 and less than or equal to 0.08 mm.

Furthermore, a communication channel extending along the radial direction is arranged on the valve seat, the communication channel is communicated with the first installation channel, and the first sealing element is arranged on one side, away from the valve port, of the first installation channel.

Furthermore, a first mounting opening is formed at one end of the first mounting channel, a second mounting opening is formed at the other end of the first mounting channel, the first mounting opening is located above the second mounting opening, the sectional area of the second mounting opening is larger than that of the first mounting opening, the cross-sectional area of the valve needle is larger than that of the first mounting opening, and the cross-sectional area of the valve needle is smaller than that of the second mounting opening, so that the valve needle can be mounted in the first mounting channel through the second mounting opening.

Further, the electronic expansion valve further comprises: and the valve core is arranged in the first installation channel and is provided with a valve port, the inner wall or the end surface of the valve core forms a sealing surface, and the sealing surface is used for being matched with the outer wall surface of the valve needle to form a sealing structure.

Further, the inner wall of the valve core forms a sealing surface, the valve core is provided with a first end and a second end which are oppositely arranged, the first end is arranged on one side of the second end close to the valve needle, and the flow area of the sealing surface is gradually reduced along the extending direction from the first end to the second end.

Further, the electronic expansion valve further includes: the valve core sleeve is at least partially arranged in the first installation channel and is positioned at one end, far away from the valve needle, of the valve core, and the end of the valve core sleeve is abutted against the end of the valve core.

Furthermore, a balance channel is arranged in the valve needle, the balance channel comprises a first section close to the valve port and a second section far away from the valve port, and the inner diameter of the first section is larger than that of the second section.

Use the technical scheme of the utility model, through set up first sealing member and cooperation have suitable magnitude of interference between needle and disk seat, can enough satisfy sealed demand and prevent the drunkenness, can make the needle again can follow axial displacement smoothly in order to carry out the switching to the valve port.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram illustrating a partial structure of an electrically operated valve provided according to an embodiment of the present invention;

FIG. 2 shows an exploded view of the partial structure of FIG. 1;

fig. 3 is a schematic view illustrating an installation structure of a screw, a bearing and a spring housing according to an embodiment of the present invention;

fig. 4 shows a schematic structural diagram of a bearing sleeve provided in accordance with an embodiment of the present invention, which is fitted over a screw rod;

fig. 5 shows a schematic view of the structure of fig. 1 mounted on a mounting substrate.

Wherein the figures include the following reference numerals:

10. a valve seat; 20. a valve needle; 30. a valve core; 31. a sealing surface; 41. a first seal member; 42. a second seal member; 43. a third seal member; 50. a spring housing; 60. a spring; 70. a screw; 80. a bearing; 90. a valve core sleeve; 91. a main body portion; 92. a positioning part; 100. and (5) mounting a base body.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1 to 5, an embodiment of the present invention provides an electronic expansion valve, which includes a valve seat 10, a valve needle 20 and a second sealing element 42, wherein the valve seat 10 is provided with a first installation channel extending along an axial direction, and a valve port is provided in the first installation channel. The valve needle 20 is movably mounted in the first mounting channel to block or avoid the valve port, and a mounting gap is formed between the wall surface of the first mounting channel and the outer wall of the valve needle 20. A first seal 41 is mounted on the valve needle 20, the first seal 41 being located in the mounting gap to seal the mounting gap by the first seal 41. The first sealing element 41 and the first installation channel are in an interference fit structure, and the interference of the first sealing element 41 is l, wherein l is larger than 0.3 mm.

By adopting the electronic expansion valve provided by the embodiment, the first sealing element 41 is mounted on the valve needle 20, and the first sealing element 41 is positioned in the mounting gap between the wall surface of the first mounting channel and the outer wall of the valve needle 20, so that the mounting gap can be effectively sealed by the first sealing element 41, the situation that fluid flows out from the mounting gap in the working process of the electronic expansion valve is avoided, the sealing performance of the electronic expansion valve is effectively ensured, and the sealing effect is improved. And l is more than 0.3mm, so that the valve needle 20 can be effectively prevented from moving. The interference of the first sealing element 41 in this embodiment is smaller than that of a conventional sealing element, so as to ensure that the valve needle 20 can move smoothly in the first mounting channel, and prevent the valve needle 20 from moving. Therefore, through the utility model provides a technical scheme can solve the relatively poor technical problem of sealing performance of electronic expansion valve among the prior art.

In addition, the sealing element is arranged in the mounting gap, so that the movement of the valve needle 20 can be effectively reduced, and the noise is further reduced.

Specifically, the first sealing element 41 in this embodiment is a sealing ring, and the sealing ring is sleeved on the valve needle 20. By adopting the structure, the structure is simple, the sealing is convenient and effective, and the sealing effect is effectively ensured.

The outer wall of the valve needle 20 in this embodiment is provided with a mounting groove, the sealing ring is mounted in the mounting groove, and the outer diameter of the sealing ring is larger than the outer diameter of the valve needle 20. By adopting the structure, the sealing ring can be conveniently in interference fit with the first mounting channel, the sealing performance can be ensured, and the valve needle 20 can be prevented from moving.

In the present embodiment, the distance between the wall surface of the first mounting channel and the outer wall of the valve needle 20 is d, 0 < d ≦ 0.08 mm. By adopting the structure, the valve needle 20 is not easy to be clamped when moving axially, and a certain guide space is convenient for sealing the valve port.

In the present embodiment, a communication channel extending in the radial direction is further provided on the valve seat 10, the communication channel is communicated with the first mounting channel, and the first sealing element 41 is provided on the side of the first mounting channel away from the valve port. By adopting the structure, the sealing device can be conveniently and effectively sealed, and the sealing performance is improved.

Specifically, in the present embodiment, one end of the first mounting channel forms a first mounting opening, the other end of the first mounting channel forms a second mounting opening, the first mounting opening is located above the second mounting opening, the cross-sectional area of the second mounting opening is larger than that of the first mounting opening, the cross-sectional area of the valve needle 20 is larger than that of the first mounting opening, and the cross-sectional area of the valve needle 20 is smaller than that of the second mounting opening, so that the valve needle 20 is mounted in the first mounting channel through the second mounting opening. With such a structure, the valve needle 20 is installed from the second installation opening during installation, which facilitates the installation operation.

In the present embodiment, the electronic expansion valve further includes a valve element 30, the valve element 30 is installed in the first installation channel, the valve element 30 has a valve port, an inner wall or an end surface (here, the end surface may refer to an upper end surface, a lower end surface, or an upper end surface and a lower end surface) of the valve element 30 forms a sealing surface 31, and the sealing surface 31 is used for cooperating with an outer wall surface of the valve needle 20 to form a sealing structure. By adopting the structure, the valve port can be conveniently and effectively sealed, and the sealing performance is improved.

Specifically, the inner wall of the valve element 30 forms a sealing surface 31, the valve element 30 has a first end and a second end which are oppositely arranged, the first end is arranged at one side of the second end close to the valve needle 20, and the flow area of the sealing surface 31 is gradually reduced along the extending direction from the first end to the second end. With such a structural arrangement, the sealing performance between the valve needle 20 and the valve core 30 can be improved, and the leakage between the valve core 30 and the valve needle 20 can be reduced.

In the present embodiment, the valve core 30 has a tubular structure, and the outer shape of the valve core 30 is matched with the shape of the second mounting port, so that the valve core 30 is mounted in the first mounting passage through the second mounting port. By adopting the structure, the valve needle 20 is firstly installed from the second installation opening during installation, then the valve core 30 is installed from the second installation opening, the valve core 30 can also be set to be in a large-caliber structure, and further the valve port can be set to be in a large caliber, so that the large-flow circulation is convenient to realize.

Specifically, the electronic expansion valve further includes a valve core sleeve 90, at least a portion of the valve core sleeve 90 is mounted in the first mounting channel, the valve core sleeve 90 is located at one end of the valve core 30 away from the valve needle 20, and an end of the valve core sleeve 90 abuts against an end of the valve core 30. By adopting the structure, the valve core 30 can be effectively positioned by arranging the valve core sleeve 90, and the stability of the valve core 30 is improved. In addition, the structure of the integrated valve seat 10 is convenient to change into a split type and a subscription, and the installation operation is convenient.

In this embodiment, a balancing passage is provided in the valve needle 20 to balance the pressure across the valve needle 20. Specifically, the balancing passage includes a first section near the valve port and a second section far from the valve port, and the inner diameter of the first section is larger than that of the second section. By adopting the structure, the balance channel can be matched with different calibers conveniently.

The valve seat 10 in this embodiment may be a circular ring structure, and the electronic expansion valve further includes a spring sleeve 50, a spring 60, a screw 70 and a bearing 80, wherein one end of the spring sleeve 50 is sleeved on the end of the valve needle 20, the spring 60 is installed in the spring sleeve 50, and the screw 70 is disposed at the other end of the spring sleeve 50; the bearing 80 is sleeved on the screw 70, and the bearing 80 is positioned between the screw 70 and the spring sleeve 50. With the structure, because the bearing 80 is arranged between the screw 70 and the spring sleeve 50, a soft sealing structure can be adopted between the valve core 30 and the valve seat 10 (the valve core 30 is made of plastic materials, so that the soft sealing structure can be conveniently formed), so that the friction force between the valve core 30 and the screw 70 is smaller than the friction force between the valve core 30 and the valve seat 10, and the abrasion problem of the soft sealing valve port is avoided.

Specifically, the electronic expansion valve in this embodiment further comprises a driving assembly for driving the valve needle 20 to move axially to open or close the valve port. The drive assembly comprises a rotor assembly and a nut assembly, the rotor assembly is sleeved on the outer side of the nut assembly, one end of the screw rod 70, far away from the valve needle 20, is fixedly connected with the rotor assembly, and the rotor assembly drives the valve needle 20 to axially move through the screw rod 70 so as to adjust the opening of the valve port. The nut component is internally provided with internal threads which are connected with the valve needle 20 through threads, and the nut component is fixedly connected with the valve seat 10 through a connecting piece.

Specifically, the spool case 90 in the present embodiment includes a main body portion 91 and a positioning portion 92, at least a portion of the main body portion 91 is inserted into the second mounting port, and an end portion of the main body portion 91 abuts against an end portion of the spool 30. The positioning portion 92 is provided to protrude from the outer wall of the main body 91, and the positioning portion 92 is used for positioning in contact with the end of the valve seat 10. By adopting the structure, the valve core 30 can be positioned better, and the stability of the valve core 30 is improved.

Preferably, the main body 91 and the positioning portion 92 in this embodiment are integrally formed, so as to facilitate production and manufacturing.

In the present embodiment, the positioning portion 92 is connected to the end of the valve seat 10 by welding, so as to further improve the positioning stability of the valve core 30 and the installation stability of the valve core sleeve 90.

Specifically, the electric valve in the embodiment further includes a mounting base 100, the mounting base 100 has a second mounting channel, and the valve seat 10, the valve core 30 and the valve core sleeve 90 are all mounted in the second mounting channel. Wherein a second seal 42 may be provided between the mounting base 100 and the valve seat 10. Alternatively, a third seal 43 may be provided between the mounting base 100 and the spool case 90. Alternatively, a second seal 42 may be provided between the mounting base 100 and the valve seat 10, and a third seal 43 may be provided between the mounting base 100 and the spool case 90.

Preferably, in the present embodiment, a second seal 42 is provided between the mounting base 100 and the valve seat 10, and a third seal 43 is provided between the mounting base 100 and the spool case 90. By adopting the structure, the sealing performance of the electric valve can be improved conveniently.

In the present embodiment, the mounting base 100 is a valve body or a mounting table, and the mounting condition can be determined according to actual use.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the sealing performance is improved, and the valve needle is prevented from moving.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic expansion valve, comprising:

the valve seat (10) is provided with a first mounting channel extending along the axial direction, and a valve port is arranged in the first mounting channel;

a valve needle (20) movably mounted in the first mounting channel to block or avoid the valve port, wherein a mounting gap is formed between the wall surface of the first mounting channel and the outer wall of the valve needle (20);

a first seal (41) mounted on the valve needle (20), the first seal (41) being located within the mounting gap to seal the mounting gap with the first seal (41);

the first sealing element (41) and the first installation channel are in an interference fit structure, and the interference magnitude of the first sealing element (41) is l, wherein l is larger than 0.3 mm.

2. An electronic expansion valve according to claim 1, wherein the first sealing member (41) is a sealing ring, which is arranged around the valve needle (20).

3. An electronic expansion valve according to claim 2, wherein the outer wall of the valve needle (20) is provided with a mounting groove, the sealing ring is mounted in the mounting groove, and the outer diameter of the sealing ring is larger than the outer diameter of the valve needle (20).

4. An electronic expansion valve according to claim 1, wherein the distance between the wall surface of the first mounting passage and the outer wall of the valve needle (20) is d, 0 < d ≦ 0.08 mm.

5. An electronic expansion valve according to claim 1, wherein the valve seat (10) is further provided with a radially extending communication channel communicating with the first mounting channel, the first seal (41) being provided at a side of the first mounting channel remote from the valve port.

6. An electronic expansion valve according to claim 1, wherein one end of the first mounting passage forms a first mounting opening and the other end of the first mounting passage forms a second mounting opening, the first mounting opening being located above the second mounting opening, the cross-sectional area of the second mounting opening being larger than the cross-sectional area of the first mounting opening, the cross-sectional area of the valve needle (20) being smaller than the cross-sectional area of the second mounting opening, such that the valve needle (20) is mounted into the first mounting passage via the second mounting opening.

7. The electronic expansion valve of claim 6, further comprising:

and the valve core (30) is arranged in the first installation channel, the valve core (30) is provided with the valve port, the inner wall or the end surface of the valve core (30) forms a sealing surface, and the sealing surface is used for being matched with the outer wall surface of the valve needle (20) to form a sealing structure.

8. An electronic expansion valve according to claim 7, wherein the inner wall of the valve element (30) forms the sealing surface, the valve element (30) having a first end and a second end arranged opposite to each other, the first end being arranged at a side of the second end close to the valve needle (20), and the flow area of the sealing surface gradually decreases in a direction extending from the first end to the second end.

9. The electronic expansion valve of claim 7, further comprising:

the valve core sleeve (90) is at least partially installed in the first installation channel, the valve core sleeve (90) is located at one end, far away from the valve needle (20), of the valve core (30), and the end portion of the valve core sleeve (90) abuts against the end portion of the valve core (30).

10. An electronic expansion valve according to claim 1, wherein a balancing channel is provided in the valve needle (20), the balancing channel comprising a first section close to a valve port and a second section remote from the valve port, the first section having an inner diameter larger than the inner diameter of the second section.